row_blk = 1000;
C = zeros(size(A,1), size(B,2), class(A));
f = 1; t = row_blk;
while t <= size(A,1)
   C(f:t,:) = A(f,t,:)*B;
   f = t+1;
   t = min(size(A,1), f+row_blk-1);
end

col_blk = 10000;
C = zeros(size(A,1), size(B,2), class(A));
f = 1; t = col_blk;
while t <= size(A,2)
    C = C + A(:,f:t)*B(f:t,:);
    f = t+1;
    t = min(size(A,2), f+col_blk-1);
end